TS615IPWT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TS615IPWT

DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT

STMicroelectronics 

TS615

POWER DOWN MODE BEHAVIOUR

Figure 66 : Equivalent Schematic

Vcc +

..3

4+

A1

5_

1

Vcc -

Vcc -

14

11 +

..A2

10

_

12

Vcc +

POWER

DOWN

pin6

... 2 Ouput 1

Rpdw

-Vcc

-Vcc

.. .Rpdw

13 Ouput 2

POWER

DOWN

pin6

Please note that the short circuited output in pow-

er down mode is referenced to (-VCC). No problem

appears when used in differential mode. Never-

theless, when used in single ended on a load ref-

erenced to GND, the (-VCC) level contributes to a

current consumption through the load. As de-

scribed on the Figure 68, the interest of featuring

an output short circuit in power down mode is to

keep the best impedance matching between the

system and the twisted pair telephone line when

the modem is in sleep mode. By this way, the mo-

dem can be waked-up with a signal from the line

without any damage of this signal. This concept is

particularly intended for the ADSL over voice mo-

dems, where the modem in sleep mode, must be

waked-up by the phone call.

Figure 67 : Matching in Sleep Mode

Figure 68 : Standby Mode. Time On>Off

0

-1

-2 Vout

Enabled Output

-3

-4

-5

Vpdw

Disabled Output

-6

0

10

20

30

40

50

Time (µs)

Figure 69 : Standby Mode. Time Off>On

1

0

Disabled Output

−1

−2

−3

−4

−5

−6

0

1

2

3

Time (µs)

Vout

Enabled Output

Vpdw

4

5

Figure 70 : Standby Mode. Input/Output Isolation

vs. Frequency

AV=+4, Rfb=620Ω, VCC=±6V, Vout=3Vp

0

-10

Consumption=80µA

Matching

-20

12.5Ω

Transformer

-30

1:2

-40

TS615 5Ω max.

25Ω

Line (100Ω)

-50

-60

12.5Ω

-70

POWER DOWN

-80

-90

-100

The system can be waked-up

from the line

-110

-120

-130

10k

100k

1M

10M

Frequency (Hz)

23/27

Share Link: